The venerable AR-platform has its quirks, yet, like the FN-FAL before it has become the right arm of the free world. IMHO.
I’ve built dozens of both platforms.
I’m partial to the AR for a variety of reasons, not the least of which is a course I took many years ago at (the now-closed) Central Virginia Tactical range in Louisa, VA “Precision shooting with imprecise components.”
With a homebuilt AR15 (80% receiver, stock internals, upper/barrel a stock Stoner OTC setup from MidwayUSA), range brass handloads with surplus powder and pulled 55gn bullets (also a variety of OTC ammo like Winchester, Eagle, PMC), a 16” suppressed (I had, others not) 1:9 barrel, and non-magnified RED DOT (I’m partial to Eotech, YMMV) sights I (and others who were in the class and had taken it before) reported the same net results:
sequential torso hits at 700 yds are not only possible, but repeatable. Sure, with an SS109 or similar round it’s like getting hit with a supersonic ice pick even at that range, but with 55gn FMJs it’ll keep interlopers off your back forty with some authority.
Banging and clanging prairie dogs, Pepper Poppers, head and torso steel at mixed ranges from 100 to 500 yds became easier throughout the day.
I’ve also used the same carbine on other range exercises, CQB drills, other fun things.
No need for a $2000 branded firearm. My homebuilt gun cost me, when I built it, about $550, plus the cost of the suppressor, first one I ever bought about 1997 through Ty Meligan up in Oregon for $200 (plus NFA tax), and I’ve run thousands of rounds through this gun. It’s never had a “jam”, (dual feed, FTF, FTE), and, honestly, I’ve probably broken it down to clean/check wear 3 times since assembly. Not much to really clean on an AR once you get it down pat. Little brushing, mopping, decarbonizing the bolt, and I always, always use Mobil 1 diesel engine oil for lube, 5W40 works as well as anything. Cheap, a quart will last a lifetime.
Keep it simple, the way Eugene Stoner designed it, with the right powder/ammo, relatively clean, and train.
Please explain more about why you use the Mobil 1 diesel oil. My questions are why, on what parts, and in what quantity. I’m looking to learn. Thanks